Lamp base



FIG. 1 is a perspective view of a lamp base showing our new design;

FIG. 2 is a front side elevational view of a lamp base, the rear, rightand left side being mirror images;

FIG. 3 is a top plan view of a lamp base; and,

FIG. 4 is a bottom plan view of a lamp base.

The shade shown in broken lines is for illustrative purposes only.

The ornamental design for a lamp base, as shown and described.